Setts



Patented June 6, I899.

A. W. ROGERS &. S. W. WINSLUW. METHOD OF MAKING ABRASIVE PAD COVERS FORBUFFING MACHINES.

(Applica tion filed Apr. 18, 18Q3 (No Model.)

UN-TTED STATES PATENT F FICEQ ANDREW 1V. ROGERS AND SIDNEY W. lVINSLOlV,OF BEVERLY, MASSACHU- SETTS, ASSIGNORS TO SIDNEY W. \VINSLOW, TRUSTEE,OF SAME PLACE.

METHOD OF MAKING ABRASlVE PAD-COVERS FOR BUFFlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 626,300, dated June 6,1899.

Application filed April 18, 1898- Serial No. 470,921. (No model.)

To aZZ whom it may concern.-

Be it known that we, ANDREW W. Roenns and SIDNEY W. lVINsLOW, ofBeverly, county of Essex, State of Massachusetts, have invented anImprovement in Methods of Making Abrasive Pad-Covers forBaiting-Machines, of which the following description, in connection withthe accompanying drawings, is a specification, like letters on thedrawings representing like parts.

Our invention relates to a method of making abrasive covers for pads ofbuffing-machines forbuffing the soles of boots and shoes such, forexample, as shown in Letters Patent to WVinslow and Fifield, No.221,647, dated November 11, 1879.

The present invention consists of a method of making abrasive covers ofthe kind shown and described in an application of A. W. Rogers, one ofthe joint inventors of the present invention, said pad-cover having acircular working face and an inturned marginal portion overlying aportion of the pad or foot on which the abrasive cover is used in themachine and said coverbeing molded so that the angle or fold between theworking face and overlying portion is properly curved to correspond withthe shape of the pad or foot. In order to produce such a pad-cover inaccordance with the present invention, a flat blank or piece of suitablematerial, preferably the emery-cloth of commerce, is yieldingly securedaround its marginal portion, as by being fastened between clamps, andthe middle unclamped portion is then subjected to lateral pressure,which stretches and bulges the material and at the same time causes themarginal clamped portion to slip between the clamps and to contract ordraw in toward the center of the blank, which at the end of thisoperation is of smaller size at its periphery than the original blank,but is stretched laterally, so as to provide fullness within thecontracted periphery. The stretched or f ulled portion is then expandedlaterally with relation to the periphery, so that the material withinthe clamped periphery becomes expanded to a larger diameter than theclamped periphery, thus bringing the cover to the desiredshape. Thestretching and expanding may be performed as two consecutive operationsor may be performed simultaneously, or substantially so, the resultbeing that a flat blank has its marginal portion contracted and theportion within the margin expanded and folded as required.

Figure l is a sectional view illustrating the first portion of theprocess; Fig. 2, a sectional view illustrating the final portion of theprocess; Fig. 3, a plan view of a die or former that may be employed toexpand and fold the stretched material; Figs. at and 5, a plan view andtransverse section of the original blank; Figs. 6 and 7, similar viewsof the same blank with its margin contracted and the portion within themargin stretched to produce the necessary fullness, and Figs. 8 and 9similar views of the completed article.

In order to produce a molded abrasive cover for a buliing-machine inaccordance with this invention, a blank (6, Figs. 4 and 5, of a propersize and shape and suitably tempered or softened by moisture, is takenand its marginal portions are then secured between the clamp members 19b (see Fig. 1,) which are shown as in the form of flat plates having acircular opening of a size less than that of the working face of thefinished pad-cover, said plates being pressed by any suitable meansagainst the margin of the blank between them, so as to hold the samefirmly, but not so firmly as to prevent the material of the blank fromslipping between them when acted upon by a considerable strain, not,however, enough to endanger the breaking or tearing of the material. Thesaid blank, with its marginal portion thus yieldingly clamped, then hasits middle portion pressed in the direction transverse to its plane,preferably by a convex-ended plunger 0, which thus stretches the portionof the material within the opening of the clampplates and at the sametime draws the clamped marginal portion inward toward the center, andthus contracts the margin while stretching the middle portion, so thatthe blank is brought to the condition shown in Figs. 6 and 7. Thestretching should not be sufficient to wholly pull the marginal portionfrom between the clamping-plates, and while the marginal portion,contracted as has been described, is

and producing a fold at the periphery of the expanded portion, as shownat a in Figs. 8 and 9-. It is not essential that the marginal portionshould yield during such expansion of the stretched portion ifsufficient fullness has been already provided; but the expandingoperation may take place while the margin is contracting, and thecomplete expansion may be sufficient to draw the margin out from theclamps by the time that the blank is brought to the desired shape forthe working pad-cover. Any suitable former or die capable of expandingcircumfer'entially may be employed for thus expanding and folding thematerialas, for example, a former d, Fig. 2, having a number ofradially-movable segments d (see Fig. 3,) capable of being moved outwardor inward simultaneously. The former is shown as provided with aflexible band 01 passed around the ends of the said movable segments dto cover the spaces between them. as they expand; but the said band maybe omitted and the said expanded former may be given a rotary movementwhile or afterexpanding, so as to act upon all parts of the fold in thematerial being molded or formed.

It is obvious that the same device might be employed both to produce thelateral stretching of the blank and the expansion and foldv ing and thatthese operations may be performed simultaneously by an expanding-former,such as shown in Figs. 2 and 3; but it is believed that the best resultsare attained by first stretching and subsequently expanding, as has beenheretofore described.

The blank may be of any desired shape, and when the inwardly-folded oroverlying part is to form a complete annular flange, as shown in Figs. 8and 9, a circular blank, such as shown in Fig. 4, will be used, but itis obvious that blanks of other shape may be employed, in which case theoverlying or attaching part may be varied in shape from a completeannular fiange; but in all cases the fold or junction between theworking face and the overlying part will be molded to the propercurvature by the hereindescribed process.

WVe claim That improvement in the art or method of making abrasivecovers for buffing-machine pads which consists in yieldingly holding themarginal portion of a fiat blank and applying pressure to the middleportion thereof in a direction transverse to its plane hereby saidmiddle portion is stretched and the marginal portion contracted; andthen applying expansive pressure in said stretched middle portionwhereby it is re-formed, being eX- panded to a greater diameter than theinner edge of the restrained and contracted margin substantially as andfor the purpose described.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

ANDREV WV. ROGERS. SIDNEY WV. WINSLOW.

Witnesses:

J os. P. LIVERMORE, JAs J. MALONEY.

